20405960

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{1039}}^1$

素因数の和:1541

約数の個数: 32

約数和(自身を含む): 46051200

約数和(自身を除く): 25645240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 982, 1039, 1964, 2078, 2455, 3928, 4156, 4910, 5195, 8312, 9820, 10390, 19640, 20780, 41560, 510149, 1020298, 2040596, 2550745, 4081192, 5101490, 10202980, 20405960]

約数ペア:

[(1, 20405960), (2, 10202980), (4, 5101490), (5, 4081192), (8, 2550745), (10, 2040596), (20, 1020298), (40, 510149), (491, 41560), (982, 20780), (1039, 19640), (1964, 10390), (2078, 9820), (2455, 8312), (3928, 5195), (4156, 4910)]